import { AnyExtension, MaybeThisParameterType, RemoveThis } from "../types.ts";

export function getExtensionField<T = any>(
  extension: AnyExtension,
  field: string,
  context?: Omit<MaybeThisParameterType<T>, "parent">,
): RemoveThis<T> {
  if (extension.config[field] === undefined && extension.parent) {
    return getExtensionField(extension.parent, field, context);
  }

  if (typeof extension.config[field] === "function") {
    const value = extension.config[field].bind({
      ...context,
      parent: extension.parent
        ? getExtensionField(extension.parent, field, context)
        : null,
    });

    return value;
  }

  return extension.config[field];
}
